基于升降轨InSAR矿区地表二维形变的获取

Two-dimensional deformation acquisition of mining area using the ascending and descending orbit InSAR

结合矿区地形实际,在构建地表坡面空间坐标系的基础上,研究了雷达视线方向(LOS)形变与垂直方向形变及沿坡向形变的关系,利用升、降轨道合成孔径雷达干涉测量技术,获取了地表在坡面空间坐标下垂向与坡向的二维形变结果 .以窑街矿区为例,采用Sentinel-1A升、降轨数据基于小基线集方法分别提取升、降轨道LOS方向形变的结果并进行了复合计算,获得垂直方向和坡向方向形变.通过与概率分析法预测的塌陷数据进行比对,结果表明,利用两轨道复合的垂向形变结果能更准确地反映研究区开采沉陷的位置和边界范围;利用两轨道复合的坡向形变结果能够反映地表的水平形变特征,可用于识别不稳定坡体.

Combined with the actual situation of the terrain in the mining area, the relationship between the radar line of sight(LOS) deformation and deformation in the vertical direction and along the slope was studied based on the spatial coordinate system of the ground surface. Utilizing the ascending and descending orbit synthetic aperture radar interferometry, two-dimensional deformation results of the ground surface in the vertical and horizontal directions of the slope space were obtained. Taking Yaojie mining area as an example, the Sentinel-1 A data were used to extract the LOS direction deformation results based on the small baseline subsets method and compound calculations performed to obtain vertical and slope direction deformations. The comparison with the collapse data predicted by the probabilistic analysis method showed that the vertical deformation results could more accurately reflect the location and boundary range of the mining subsidence;the slope deformation results could reflect the surface level deformation features, and be used to identify unstable slopes.